地下水位下降会引起（） 土中总应力减小。 土中总应力增加。 土中有效应力减小。 土中有效应力增加。
You are managing a database for which incremental backups can be very time consuming. In order to perform optimized incremental backups you enable the block change tracking feature.How would you instruct RMAN to use the block change tracking feature when performing incremental backups？（） You need to mention it with every BACKUP command.。 The block change tracking feature is used automatically by RMAN.。 You need to configure it using the CONFIGURE command.。 You need to set the necessary initialization parameters to direct RMAN to use the feature.。
浇筑式沥青混凝土的造价组成中，比重较大的费用依次是（）。 沥青材料费。 人工费。 粗集料材料费。 机械费。
馈线到天线端的小区连接和机柜端的小区连接需（） 正确。 不需要对应。
Examine the data from the EMP table: EMP_ID DEPT_ID COMMISSION 1 10 500 2 20 1000 3 10 4 10 600 5 30 800 6 30 200 7 10 8 20 300 The COMMISSION column shows the monthly commission earned by the employee. Which three tasks would require subqueries or joins in order to perform in a single step? （） Deleting the records of employees who do not earn commission.。 Increasing the commission of employee 3 by the average commission earned in department 20.。 Finding the number of employees who do NOT earn commission and are working for department 20.。 Inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3.。 Creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSIONS of the EMP table.。 Decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more then 800.。
构建学习型组织的管理策略包括（）
